Abstract:

Parallel to the rapidly growing industry and population in the modern world, the use of motor vehicles is increasing. Motor vehicles are known to play an important role in the emergence of life-threatening problems such as environmental pollution, global warming and climate change. Many national and international agreements are increasingly limiting motor vehicle emissions. Especially diesel engines, economical fuel consumption, cheap fuel and high heat efficiency are widely used in transportation, transportation, heavy service machinery and passenger cars. Diesel engines release nitrogen oxide (NOx) and particle (PM) that are harmful to human and environmental health. One of the effective and built-in systems used to reduce NOx emissions in diesel engines is the exhaust gas recirculation (EGR) system. In the EGR system, the emission of NOx is reduced by reducing the burning room temperature by mixing the emission gas with the absorption air. However, the absorption of EGR gases will increase the temperature of filling. Since this will cause a deterioration of volume yield and a negative impact on the burning process, the exhaust gases must be cooled before mixed with the absorption fill. Generally, EGR gases are cooled by passing through a heat exchanger. In this experimental study, the EGR refrigerator is equipped with an external electronic-controlled cooling system consisting of a radiator separated from the motor main cooling system, an electric water pump, an electric fan, a temperature sensor and an electronic controller. The tests were conducted in stable state working conditions, at 1,700 rpm, at 5.10,15% EGR rates, in loaded and high conditions. Thanks to the controlled EGR cooling system, EGR gas temperatures have been tried to keep at points where optimum NOx emissions can be obtained for each turn. It has been observed to be effective in reducing NOx emissions and brake-specific fuel consumption (BSFCs) in stable and light load working conditions.

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